package com.qch.demo;

/**
 * @Author qch
 * @Date 2021/8/9
 */
public class FinalizeEscapeGC {
    public static FinalizeEscapeGC SAVE_HOOK = null;

    public void isAlive() {
        System.out.println("yes, i am still alive :)");
    }
    public void so() {
        System.out.println("im here");
    }
    @Override
    protected void finalize() throws Throwable {
        super.finalize();
        System.out.println("finalize method executed!");
        FinalizeEscapeGC.SAVE_HOOK = this;
        this.so();
    }

    public static void main(String[] args) throws Throwable {
        SAVE_HOOK = new FinalizeEscapeGC(); //对象第一次成功拯救自己
        SAVE_HOOK = null;
        System.gc();
        // 因为Finalizer方法优先级很低， 暂停0.5秒， 以等待它
        Thread.sleep(500);
        if (SAVE_HOOK != null) {
            SAVE_HOOK.isAlive();
        } else {
            System.out.println("no, i am dead :(");
        }
        //下面这段代码与上面的完全相同，但是这次自救却失败了
        SAVE_HOOK = null;
        System.gc();
        // 因为Finalizer方法优先级很低， 暂停0.5秒， 以等待它
        Thread.sleep(500);
        if (SAVE_HOOK != null) {
            SAVE_HOOK.isAlive();
        } else {
            System.out.println("no, i am dead :(");
        }
    }
}
